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This reverts commit a0282608.

Reason for revert: b/169804713 

Original change's description:
> Migrate base::Callback to base::OnceCallback.
>
> BUG=764795
> TEST=build
>
> Change-Id: I8afa2fd87eb5cf5d9a8f7ecde9fad95d420c5399
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434405
> Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
> Commit-Queue: Tomasz Tylenda <ttylenda@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811980}

TBR=hidehiko@chromium.org,ttylenda@chromium.org

Change-Id: I7de1e3dac102f4c760aef90da690016b020baa3f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 764795
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440088Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Tomasz Tylenda <ttylenda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812516}